Certain Pre-Funded Warrants of Atara Biotherapeutics, Inc. are subject to a Lock-Up Agreement Ending on 23-JAN-2021. These Pre-Funded Warrants will be under lockup for 46 days starting from 8-DEC-2020 to 23-JAN-2021.

Details:
The directors and executive officers and holders of substantially all of its stockholders have agreed they will not, subject to certain exceptions offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, any shares of capital stock or any securities convertible into, or exercisable or exchangeable for such capital stock, or publicly announce an intention to effect any such transaction, whether any transaction is to be settled by delivery of our common stock or such other securities, in cash or otherwise during the period ending 45 days after the date of this prospectus, without the prior written consent of Citigroup Global Markets Inc., Evercore Group L.L.C. and Mizuho Securities USA LLC.